Sorry, I didn't read it thoroughly.
How high did your ammonia get? I know that high ammonia can lead to algae, but I'm assuming since you used fish that you did alot of water changes.
Also, what all fast growing plants do you have? You may need even more to outcompete the nutrients.
For now, cut the lighting back to 6-7 hours, but use all 4 bulbs. Remove as much of the algae as you can, even if it means cutting off some leaves/stems and trimming the plants way back. They'll grow back. Do small water changes to keep the nitrIte level down for the fish. You have a good deal of light with the T5 HOs, so you should start dosing some fertilizers. This should make the plants healthier and make them grow faster. I suggest getting some potassium and some trace nutrients, like Flourish. Dose each of them twice a week on separate days.
Keep picking out what you can, even if it means cutting the plants back. Hopefully when you get your nutrients balanced and get more stem plants in the tank, the algae will be outcompeted.